SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'e1ace649a5506c862b764fafc5291ceca758a3d34b94de11f6d7759a2ed8b6d8' 
  AND token = 'PJGRpyE5KytE4hezW79XYMq04vBIwn+TEfhQqlPbnBA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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