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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'f623e248ad53d6f1529b89f49b8d221301bd8a8a2f5f99051ff1fd312b1b2ab5' 
  AND token = '5ISXAyDhCoXkVlQANtPTvNY3/PcoGe8mUDzb9yRxn/o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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