SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'fec86d95ff967173303776987d28931332273a4827007f4a9084471e28cd2b93' 
  AND token = 'dvBgCbSaQKABV95W7Okb9P2Tjsis9FFP3cRIUHXeqzw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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