SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '9ded7265f4114ae5cb19b634e2786e3c3992f6eb968d6b1c87175e95dd0c9e6b' 
  AND token = 'DMupBLcqpYmhGsqHrbYJmnuZer63gXj7JBnCwDJW6H4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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