SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '0a73823836449f9c912534fa53f984300aad85d36184f7e113ebcfe751d90d76' 
  AND token = 'JR+ayzSlX2Qj9KwCfVd8B2I82bTnvGKu0FJE16UiTVA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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