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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '1b4540e33cc93f3a87fa100725d36fcbbf5e96f43ec917b7f99d2c71f8baccd4' 
  AND token = '0RFhcUH6D1PnTL7bATwB/2xgN8wG02ZKQkk70l81lcU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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