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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'cc8561bb9e5b0307522cb839756646ab2c8863a4b755f1560e57b1a464c6d915' 
  AND token = 'OHwsY2g+kmCMqTj9R47RDIDxK57n2uoGq7b92o3AYew=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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