SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '346441f2ac071a5375b1d324f66e8b0a4c9a20cb9738707ca2da6f52dc360fe9' 
  AND token = 'oM0/YhDNowfdRWB1PTVq502E/oo7uKeUTawN5njGZpU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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