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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '406556c58e1677f27f1c14369a59155e64b137265dfc9e4456e9034c0ea5fd5a' 
  AND token = 'T19jBSODx8PnrB9CaJOCn9kAULVmqqCyIEPryG/BPOk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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