SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '3372e6559a6d16a4a778d42f6226dbe9f2703703141c8aeb6e13e4559481640f' 
  AND token = 'KFnuPTHZ745DS1C+Zo+wKK6ucHbJcq6vnCPEVeQr//A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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