SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '08293cb5de45a4af6a3046986213c055c4f0b2145bad9fddeb5aaf16f0f36e47' 
  AND token = 'ZtMIIBWGSz2ZYFe/kmUJF08VNqWP6TyWlrJkKwWNmRE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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