SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '599b447d1ece66d74c60551e98607a5b832fabae988311d139ef875246076499' 
  AND token = 'Htq6bTHSLHctCZmJKz692LnyGIpmS+3TpEA/lBn1UFA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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