SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '4aab936df013a70c6d905235d0105c04af3f726db77d7bda5df4401161493f5d' 
  AND token = 'oPORehYZF9Hclh13H/gIDGvcSqUVQFBhyjMbxEBNvSU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00055

JSON explain

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