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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '9671dbc5e5b0b855fc4430e6f1be1e5c8a008f1e204666fc78435af0dc5c2852' 
  AND token = 'CTz+RVE0rJtes60r5BQRvxsj0j8vTqqhI9oGYETXu4U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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