SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '8fc98b9591385fe4748fea81264d2f82595cc01219706c71cd3e875a900bff64' 
  AND token = 'baVLt9WWhkW+/w+6CAUAgQ/MUV1PcB65dAQX/n65jaA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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