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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '081335f891088c3fe5e3043609cf5f21dcefeb71b1333cdcd85c1e47219a9191' 
  AND token = '+SJAhRpP/itqrwKPoxPXT7okUsgKxe+JOX8ggsJx3jU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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