SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '84ebfa3c85b7cd567a221477b83283031dc1ab7981927045c73fbd356eda57ef' 
  AND token = 'c/FN/pcF+swStJa/s8GjB4Xk0jLRX549hK98Gr0Vw90=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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