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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '2f84873c8579e0f9b5af058233e29f8f741643e4995bb85da3ab69af09ed0c4d' 
  AND token = 'WhwNl017kWCZPNI+WT7PNvsA2a6V4wef5xr+NmwuISY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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