SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '9eddf38cd54cc08573eb70d9df9c81b61abc16cd0e545a6f56b1c522e4032842' 
  AND token = 'fzXoZ/IB6vTaDDz2BUgNmhVB8rHS3MRsT/unnYb0vx0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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