SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'ecc1616d870b7ac2de7078a69d481836df392a6947d637387e72f78831ba281c' 
  AND token = 'qpNFUq9YiVR4cigDQf/VvJXGFVo3+ZSM0rx9zk+W1Gw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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