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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '7331c89866031d07a8dee363e849bc8d3f0831d69bb87e009ab0e5537ae71258' 
  AND token = 'vRA+7KO5MIzcpTslHvklc7LyVEDyiKlZjUAhWhQh06o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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