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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '75da2fb70ff5cdd1b5afd62f3733aad1afaaa7e0d55492c3c1e20efc1f7661a4' 
  AND token = '5oMrKxZd3JyhOcLIXSh9searAsFxRDvo/5DWtr1pjxE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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