SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '8e8cc6cd915984fa6ad7aab8364681b18ccb7bbf1ea5528999f32ccdfd594823' 
  AND token = 'WzRIY+dnZxNqtKJo3z/YuEDLWgzFapTi4JL5yF712PA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00059

JSON explain

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