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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'fed7de940dd74f400e5c6d5dc58f74b893fdbfa2cdc37a5735d73105d1dafb05' 
  AND token = '6nF6Yuy0TGl4lSPasMEfq7w5MfucJyTsrp6SC5eVxBg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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