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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '7efe89454c57cd0581b462331465273c7f5d24f4bcb6c19bbb6052762584eb84' 
  AND token = 'FwtNpIhu0OlZW1BBod2xcmdHfDAHQgn82xx82MeE3k8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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