SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '974d559ebb84f1b646c7bec4b28baaef91126488599a1496c213fdcbc2d88117' 
  AND token = 'TCkzX+DtI2dZUWef2gqd89hvmQgq5YtwM9j282JKwzU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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