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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '248ec8a428c5e3a8266e7bd24a4370610a17a4a8dfdb8e99f244b8a15f0bf33f' 
  AND token = 'j27hcQumyZUp0hsiTr7oliFI6lWtC5iLpj/9Y5/B4CQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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