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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'df5376156da06075057cc49fa9f44b8278ef9a03a938c0ec4b3bb44026ac2444' 
  AND token = 'QtIcXLvY32rSHotUndNTHtr596i1ctLW97RoIiX8b68=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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