SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '55a16c7fe5b9b6dab6f851340aca64b241f820e5bbe11c9756e7c60851d1a675' 
  AND token = 'Z+j7oLhWycGReGYpuBVYsr6pvvf9X9xZRIwKffKzD4E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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