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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'ee20145cd38637fa4e41a464ac24d3efe74af7134be1255704d62c9191bcdaa4' 
  AND token = '3zf67bQfITxzSDim2esHzRilOYgDaTiaiAGDVrG2LxA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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