SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '5519e8764ecf93493f00a9b5291bd96bf31ef81623cec9130fe98d8c5d2e3ecd' 
  AND token = 'j+OFwVkZHO/CXfB7vvSTuzWrndyDNuVoV03BXkPNJ9o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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