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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '23ff614d37c52a10ad7e6557c7d182f85f265024902cef41691e00ffc0d3b9a2' 
  AND token = 'SfpBB/rGz5My4/L4iiwF6283cda8G/kyr6lPPE6NOog=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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