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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '53d3366be83c19fa920b1a00cce08bcd008933c2c551d5504a4d8d8e99ea1ac3' 
  AND token = '7w0H2LJhANakqjjkGw32NUtmwq50UCKmV0EiMlQTAwY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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