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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '39ca849351f4725a2fe18e3f4f6ea9e9319e2857e32803d39bf1b3e33e676701' 
  AND token = 'ArRwlOl7ZE12+v3smCou4p0b9/k9yBrECB10eBokjAg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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