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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '3b1c9d64b32001b068dde300e3cbed9618da13b8c57baf430215ee1e14168d40' 
  AND token = 'uJu6QIoWFccy3SVP+RysGj/E+2jFQBlZ7n0BmDg1gxY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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