SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'cf4d516b9438affd0b87a7f86b3572ef857edbd6f12ea67b6850226b7b84f0b3' 
  AND token = 's6BlXIl7fjdRH9P931DaJffjYsm61UNslmvJqR+F/rw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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