SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'e2f367ead741777286cec9dfbcd5fbd88e2948e6da951861fbc430921b360e43' 
  AND token = 'z1F/XGoI9DDbhyb/qS3TQz5/S1uRgJAwnAKv4hjOShU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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