SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '3a2481381705936f6b3186edf95a760c43e5a7f7af30e3c1413b6ac205e23ed6' 
  AND token = 'TK7AaExsXgzw2P6TgQjV0HFAAYPLRWtIB3GZ3rfSGPY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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