SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '247ac95e6649decf0838350b7fd9777a35613ce62b8436271eb80b17d418123a' 
  AND token = 'HDFOdHNsUV/x6lGdYLwuOehX1HI8gENxJNXgzRrrcdg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00079

JSON explain

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