SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '57afaf89bcb1b93c35a08cab0420b7bbae9864587e495bc4e536e1d9e2726f15' 
  AND token = 'XqnjL7ZlZrVrkTWsXnImBFzGLFsHerHRx43Vm8yX+jY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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