SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'c2c9c681c2b264b4a57ccd176c583ecd40f7f98731e2ef3d28f75a9fdf887bd7' 
  AND token = '3eHgzjybl2xCOMAKDvQM7OGOKbLFmsmZ4Sq+vfrC2zs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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