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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'f728c0fb947790b3bbfed0dd1c17678cf8cbc49cef5db58d78d7c0f298cd3430' 
  AND token = 'E/vKX4esg+Ok94N40TxPERSun3XeKemMS0lkvNl4ylY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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