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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'caebe62df276ed9cd7951d6da99f9ac8f6c258f170186764752a5a606e4836d4' 
  AND token = 'oKubt0RAMh5T509Y9BYEkFz02OCXHRt9oIKMSTnXp/c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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