SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'f9764ae213ee853650d4d850296d98f3032fc27641fcb13f33d4fc6566df72ed' 
  AND token = 'SNSSPB5kYolZ/6YOrDCANWsmOLH3JPx7Vy0xzCy1uhU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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