SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '88719bf5c058f63db3324da2bd889ba414a232e4f03189cb47b34359d6d5c8aa' 
  AND token = 'uTsALH6dUAjxjwjYqBIIt7PJBLsQ0JZLdTnjs6htrn4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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