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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'f7f34e9608d8f493a3a9df1456f73fc66649a3593a05e576eb286aecbb00873a' 
  AND token = '9qAuTsd6IfDMaeDwH5cd/kd4mLFayfL6fJzfJX3Pln8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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