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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '29139168654cbcc470881d715bc4b8be9f59b5eb3ed99388090d43b627e05baa' 
  AND token = 'ejHk0VITxBK6iEEZS7T2tSKov9/VmDmKYvdW9uXVUNo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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