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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'ea5d5c364cdc4eab1e8fa45cdc2cea6b3b963e80e772c8a0cd8b57bae8031345' 
  AND token = 'ljGAgzIi5MIuhYNESObuPGCl1iJR/Uxbewyc3vEvImU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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