Sandbox

SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'c8434e7967b8876e70abddf05fc87eab8010fc4bd154ce990a656f6a1248eb72' 
  AND token = 'jFHj0CnybZuSpiFMAesrdfIrUCScrzSSFMnsJWf/hyU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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