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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '1dadc3b1a2df1edcf7472595d6f030b0e95f8a7b1e435281f0562bbc36fa911c' 
  AND token = 'BSzZET197yuQ80QQhOASYNdv5fGpon8li4zR4oNOiHg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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