SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '27299b371555c8477316c04dacfd718ff7f9c28c120ca79b230817910d324654' 
  AND token = 'b/sxdpFGFL0VyYKaMZ0votP/s/8JzmIAGp7xpvvJEkE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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