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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '57aad24afc9a35875cb879628b92cce4c44b3ba7cc9d3a06e7ec5742460b9a35' 
  AND token = 'JsqWuaXmutxqmn5KKRaEyyQhlU4S17qPtjb1cbd8QPs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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