SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '5694870a35bde86d52a2f9c7fd229bd1825f729f5cecdc4b9dba09560c43cc2e' 
  AND token = 'HXTwv8xn+y0VU3g4dpXYFR9+fajVPgP1EVs8AquaOaQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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