SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'f9397746c34f855bcb8ad8b6e13d7b22c71c39b1ddadbf11d1503f48309bfbfe' 
  AND token = '2khRQRtmVq+o4ZSWf08mOGPg5wMNaZpxDHZdug5sqwI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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