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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'a3ad3d43ee80cc75dfa7eaae697cbaea3c93ec95a85388072b845f8d278edd4a' 
  AND token = 'fjF9crQweKjcX3Vwpdy733VrsK9DSquRmyIsBJ2JE24=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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