Sandbox

SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '0135c9b0538b26ed3cc608d1f5d811c30710c08728c2d0cfda5c1f2a7dd145ae' 
  AND token = 'RO1NQ1SUr/uiRhnOSEkZBTouTdjVy8cZqg3xOlpEeb4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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