SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '567b5de86662a14193b8e50bbbbca9aae7f739d30ef1942118f0f0709a7384d6' 
  AND token = 'fUPbzC56Ir0fZPOPoFx8mJO72kK+z8FCEhD/pMX+RrA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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