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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'c8694c8a05bd56be540af40e7e13dd21e1f93e06601644706e54e26a85835094' 
  AND token = 'a0T2yYqmGdEyKPfU3NLll8O6C/SElJV44hDF4deU6MQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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