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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '9021be53c25fd366ba5387efb97f07f587719eb4de26060b391bdaa3bf7bc111' 
  AND token = 'jFPkks+7UiBLqEIuxXuL3XcbOv5CcpI/IfKahb5i2oc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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