SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '26c2946cb55accd3b0cf6159ea65623b51717b01cbd79c54d8d612315a3f3063' 
  AND token = 'Hbuk5qBgtyxUw05GJDS/+2JlI0M+x4qoxuZqnV89fjs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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