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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '7add827fbd66b27c9e5a5b88c5f1f41b32dc22aff9c8e196aecd3568df5bc533' 
  AND token = 's3Gcw+led2LtOA7rt5bQtXo9rEsLHPjvloaK+W1j9ZI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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