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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '57da59400a077abc3681a69677eb40102bdbbf2fbf41e9d8d0283b5830adbace' 
  AND token = 'ltSrXLHJ2Yq4h9kAUspQLp1kEEzHtJtubc1LfMFGrZU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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