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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'df72e4fd2af348890e0d486ef223866b87c8cef62f6d54b27795ef724a1878cc' 
  AND token = 'vFvAmhK2AQKd6koimLE/rKIHWG46B5Ps60mcEa6+EvU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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