SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'c414cb67c386f60f495c0f6aaf7b7b5ebd908bb5534a22951d1d5fe2b45efa63' 
  AND token = 'jzKBb214dtEmYy6lRvrQVlyFsu4JTbzZBGvq1fIBJpM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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