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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '149f7ef0966a329bfcb466947effcd15d819cfa5365c8e1460e4e59bc1f6431b' 
  AND token = 'kAjPfn07b7QQDsF1vHnqljfwcaOXt6mf1KkTWqTx6Pw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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