SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '03702f181e0e8f675d11b38eadbfb558f5909d258df36762b956ec9f41753b6b' 
  AND token = 'CHD/JYIuubkyMVpd1fg2OZRoIQXbB8+vrUf0k9jUkrY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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