SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'f608103658a26c604e210ca24c34c394b90aa32028d39b4521cf90e67fd9ab65' 
  AND token = '9lccH46sQ6qeWBF2VCMRZM65OGwnUIMzfUY/jT6jzlY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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