SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '3a7800229b3c7835cd53268636f55d6ed546f62bfd7fed3e5a0111a3b8bc7a62' 
  AND token = '+HmVu7UxXCamsC7wuVU6jsBs4+6G2d/lSwjvZadbVJA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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