SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '5f3048389fa08b3b1c91097522d76de5b619f0644eff53d1c36159eb46d0c8af' 
  AND token = 'S2DBPwwh9PrDmYEeziZUTw/7vL1/m6nrBhWKK1dvf5k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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