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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '7d42aa3091a1e972b86242e121628e267cbf33336bc7110f28b7ae5df7d26908' 
  AND token = '9x02AIxdQEwFxavYjyfbxhFbB/nz4sgyAjfz7XaOeEs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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