SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '4b42bb9cf2481a7af8c1b19eeca857c81a5d3698eff83771772a44e793373cc0' 
  AND token = 'vlFKZ2efh3p/3UXkxuV5m22SbQ2XJokl/Xu5HwW6muY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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