SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'd7b409e976c565d6199d9c90f0a486e0dfeaeb10c58cad7767b76bba4382cf99' 
  AND token = '6GnKmzo1JOVsAVI1WZWNzhTx4q9Ur5dPEHvqPy+8DrM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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