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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'c4c3298beaca6de199ab1286649190ad6eb6cade6c71d25022b3db782dc0a3ff' 
  AND token = 'SrWotsD3yhUiZrIvar0l+R0jX5Fl9xwfgim3dnzz+e4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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