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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '6cd3f0822ec88721e53e3e852e09281064ae3e7ffde31b69e05bd125ebddf7d3' 
  AND token = 'torr79YZ5jUqafcPY7WugTKjnLaWSpk+wjL5NwSZEs4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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