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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'ead28fd8f352e51dca579ebff720ce10e8980e46f03107d353c11266aa530cb1' 
  AND token = 'b78kXk9mzAlu4DPdsA2Cr2EUHnQvIGBdfXWs9xHBOcE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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