SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '82a83c20ac2684d8b41a83257b1ca7d8038f8109b28c9df5f459f7b67d89649d' 
  AND token = 'HpCGxtPSybd1+7+PbfRS/V19GG+jQSm2LGuYA3igJX8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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