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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '75fe0aa5db96adc76251316a42532c38116d3cdb41832649136b9d0376e7e250' 
  AND token = 'wIbxBcRHl3utTppiakzNx2nNi2iXrj4KOpQqs63TKcc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}