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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '999539db5e19e2b974f2a25076ab997d18d0f4ff01ea14a09d89d533e1e7a784' 
  AND token = 'gx1OY+IO9ie2rdzA5VZkBFLIQ1nyBhfqG3XAietx2k4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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