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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'ecb5e7da833b78ac7d6113e288b41e316a106c57a37a4ebecd12ab278bee4cc5' 
  AND token = 'l+LJvCZ8WKDT13YJnM8ihgNdb14waMGtjvwJ9kJz37g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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