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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'e334e25c31ff08d90cafa632e52e7b5b8583989ab7f065bfab9ed0683d3e8609' 
  AND token = '4X3WqtDo2hckQO9JOCKzogXjtNNjvA6OiNiVf0jbaLw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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