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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'ac35114b760710a4e91215deaa4967b529ead4cce27e39d0037a15ff65b96260' 
  AND token = 'fR7v03M66wyK907HXfbkBgXgJS63yu8bsoCqZrXkTU8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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