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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '3f4028cb7c7fb5c2292985b7bee46d8329fc7bf7e8b58e3540c823a568f7bfea' 
  AND token = 'qUvCln0d89GcBefIOFTHYz71bIY8LRX7WJAIh81Bz24=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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