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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '2f4b7b6a310f8a3fc7be6e58fd64bf722ee96b5e0d5ce7debb1a8dd0001f182c' 
  AND token = '5+bE06ymw4tylsMi1MiaB8+ihGoSpDndZIliKx+ujXg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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