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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '873f82f737cce36d27d39a279284e882ee091bfd546cc61846490e26c62813ca' 
  AND token = '54DjT2ip5R53z8bdmL3A3EYxhcY5V8obxWcGOkjmJY4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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