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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '81683959c417dbd240674f331c7e0dd7e90c924253610b0fa2b02c098e8666b7' 
  AND token = 'dBt8hliQQx877LZeahgMtEQuAnNX19TzETtapNfmzOM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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