SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'd49ddb759bced72abbb571e298739598c06a79b4fa46e8e8b81db3f491eec444' 
  AND token = 'vwsBn0qfknOiBUqGAoCgDIj/HeOU0CuSnX+ZxAxbybQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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