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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '776955d6c9c685900aed3c74ec3c7f45e7766ec84ca00344b8420a10aa74d14d' 
  AND token = '++9YNQ1PSIYf7rctwjRsQSv7FW084Uv4Mb81Ic4qSdI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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